Can a UTI Affect Your Kidneys? Causes, Warning Signs and Complications

Written by - Editorial Team
Medically Reviewed by - Dr Dhananjaya Kappadi Lingappareddy

On Mon, 09 Nov 2026 Primary Care

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Is a UTI able to affect the kidneys? The answer is affirmative. When a person has a urinary tract infection, he or she is likely to have such problems as inflammation in the urethra or bladder. However, the infection can move up to the kidneys and cause a more serious problem, which is called pyelonephritis.

There are lots of patients who feel some burning sensation when they are urinating, have problems with frequent urination, or have lower abdominal pain because of a UTI. Even though at first all those things do not look very serious, neglecting them is a wrong thing to do since it makes the infection spread further.

How Does a UTI Become a Kidney Infection?

How does one’s bladder infection turn into a kidney infection? The vast majority of UTIs develop when the urinary tract is infected with bacteria via the urethra and grows in the bladder. Should the infection be left untreated, bacteria can pass up through the ureters, connecting the bladder to the kidneys.

If bacteria infect the kidneys, then one might suffer from inflammation of the said organs. This disease is called pyelonephritis, and it requires immediate medical intervention.

The ways in which a UTI may turn into a kidney infection are as follows:

Untimely diagnosis and treatment of a urinary infection.
Not completing a course of prescribed antibiotics or using them incorrectly.
Obstruction in the urinary tract due to kidney stones.
Disorders that prevent full bladder emptiness.
Structural abnormalities of the urinary tract.

Visit the Nephrology Department at Continental Hospitals, Hyderabad, for expert kidney care and advanced diagnostic services.

Warning Signs of a Kidney Infection

What are the symptoms that will show that your UTI has infected your kidneys? The symptoms of kidney infection are more serious compared to bladder infection.

Symptoms of kidney infections include:

1. Having a fever and chills: This is a sign that you have an infection and the symptoms are much more serious.
2. Having back or side pain: You may experience pain on the back and/or sides where your kidneys are located.
3. Having nausea and vomiting: Kidney infections will result in nausea and vomiting.
4. Having a burning feeling while urinating: Your urinary tract may feel a burning sensation when passing urine.
5. Urination frequently: You may have the urge to urinate frequently.
6. Having cloudy or bad-smelling urine: You might experience changes in the appearance of your urine.
7. Blood in urine: You will see changes in the color of urine from pink/red to brown.

What Are the Complications Associated With an Unmanaged Kidney Infection?

Does an unmanaged UTI result in permanent damage to the kidneys? Yes, it does happen in some cases. When an infection in the kidney is left untreated, there could be many complications associated with it.

These complications related to a UTI may include:

Kidney damage: Serious or recurring infections may damage the kidneys due to scarring.
Sepsis: Bacteria from the infection could spread into the blood, causing a systemic response to the infection.
Kidney infections: Recurring infections of the kidney are one of the complications that may occur in the future.
Kidney abscess: Sometimes an abscess develops in the kidneys.
Pregnant women: If a woman is pregnant, she requires immediate treatment because of the potential complications.

How Are Kidney Infections Diagnosed and Managed?

How do doctors determine whether a UTI has spread into the kidneys? After reviewing your symptoms, medical history, and clinical findings, a doctor can order some tests.

Some of the common diagnostic tests include:

Urinalysis: Helps in identifying any presence of infection, like white blood cells and bacteria.
Urine culture: Helps in detecting the type of bacteria that have caused an infection and aids in determining the right antibiotics to use.
Blood tests: Assist in identifying any infections and functioning of the kidneys.
Imaging studies: Recommended when there is suspicion of obstruction, kidney stones, or any complications from the condition.

The treatment of kidney infections is mostly done through antibiotics based on the kind of infection and its severity. In some cases, patients are admitted to hospitals for intravenous antibiotics and fluids.

What Are the Best Tips for Good Kidney Health to Prevent UTIs?

Can regular practices actually safeguard your urinary tract and kidney from UTIs? Yes, proper practices can decrease the risks of getting UTIs.

Tips for maintaining good kidney health are as follows:

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1. Drink adequate amounts of water unless your physician recommends you restrict your fluid intake.
2. Do not delay urination; empty your bladder on time.
3. Practice good hygiene and maintain proper cleaning of genital areas.
4. It is advisable to urinate after sex in order to prevent UTIs.
5. Properly manage any existing health condition such as diabetes.
6. Take your treatment in the prescribed manner and do not stop antibiotics on your own.
7. Make follow-up visits to your physician if UTIs occur regularly.

Why Go for Continental Hospitals for Kidney and Urinary Disorders?

Why should you choose the right hospital in cases of UTIs that can affect your kidneys? Diagnosis and treatment of kidney infections, along with the monitoring of their condition, is crucial in order to avoid potential problems.

The healthcare provider Continental Hospitals in Hyderabad provides full services related to the treatment of kidneys and urinary disorders, with the help of specialists and medical equipment, as well as high standards of treatment. The organization has obtained many healthcare accreditations in both national and international markets, such as JCI and NABH.

Due to specialists, advanced medical facilities, and the patient-oriented approach, the facility provides the identification of urinary infections and the proper evaluation of the condition of the kidneys.

Conclusion

Yes. The UTI can infect your kidneys if bacteria move from the bladder to the upper urinary tract. Identifying early signs, following medical treatment recommendations, hygiene maintenance, and adequate hydration can prevent any further issues.

Keep the following aspects in mind:

An infection of the bladder may infect your kidneys if not treated properly.
Symptoms such as fever, shivers, backache, and nausea can be associated with kidney infection.
The untreated kidney infections may result in damage to your kidneys or even sepsis.
Investigations, including urine tests, will determine the infection.
Proper and timely treatment is necessary in order to keep your kidneys healthy.

If you experience symptoms like a burning sensation while passing urine, recurring infections of the urinary tract, fever, or constant backache, please consult our best nephrologist in Hyderabad at Continental Hospitals, Hyderabad.

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Frequently Asked Questions

Can a UTI affect your kidneys?

Yes, an untreated urinary tract infection (UTI) can spread to the kidneys. This condition is known as pyelonephritis or a kidney infection. Most UTIs initially affect the bladder or urethra. If bacteria travel upwards through the urinary tract, they can reach one or both kidneys. Kidney infections can cause symptoms such as fever, chills and back pain. Some people may also experience nausea, vomiting and painful urination. Frequent urination and cloudy urine are other possible warning signs. Early treatment is important to prevent the infection from becoming severe. Doctors usually diagnose kidney infections through urine tests and other investigations when needed. Antibiotics are commonly prescribed to treat bacterial kidney infections. Delaying treatment may increase the risk of complications. In severe cases, the infection can enter the bloodstream. Anyone experiencing fever with urinary symptoms should seek medical attention promptly.

What causes kidney infections?

Kidney infections usually occur when bacteria enter the urinary tract and travel towards the kidneys. Escherichia coli (E. coli) is one of the most common bacteria responsible for these infections. These bacteria normally live in the digestive tract. Poor urinary flow can increase the risk of bacterial growth. Kidney stones may block urine flow and contribute to infections. An enlarged prostate can also prevent the bladder from emptying completely. People with diabetes may have a higher risk of urinary infections. A weakened immune system can make infections more difficult to control. Frequent or untreated bladder infections may also spread to the kidneys. Urinary catheter use can increase the risk of bacterial entry. Certain structural abnormalities in the urinary tract may contribute to repeated infections. Maintaining good hygiene and seeking early treatment can help reduce infection-related complications. A doctor can identify the underlying cause through appropriate investigations.

What are kidney infection symptoms?

Kidney infections can cause several symptoms that may become noticeable within a short period. Fever and chills are common warning signs. Pain in the back, side or lower ribs may indicate kidney involvement. Some people experience burning or pain while urinating. Frequent urination and an urgent need to pass urine may also occur. Urine may appear cloudy, dark or have an unusual smell. Blood in the urine can sometimes be present. Nausea and vomiting may develop as the infection progresses. Some individuals experience weakness, fatigue and a general feeling of illness. Severe kidney infections may cause dehydration and significant discomfort. Older adults may sometimes experience confusion or unusual weakness. Symptoms can vary depending on the severity of the infection. Seek prompt medical attention if urinary symptoms occur along with fever or back pain.

Can a UTI cause kidney damage?

Yes, a severe or untreated kidney infection can sometimes cause kidney damage. Most uncomplicated urinary tract infections do not result in permanent kidney problems. However, bacteria can spread from the bladder to the kidneys if an infection is not treated. Repeated kidney infections may increase the risk of kidney scarring. This risk is particularly important in people with urinary tract abnormalities. Children with certain urinary conditions may also be vulnerable to kidney damage. People with diabetes or weakened immunity may face additional complications. Severe infections can affect normal kidney function. In some cases, the infection may lead to sepsis, a potentially life-threatening condition. Early diagnosis and appropriate antibiotic treatment help reduce these risks. Doctors may recommend blood tests and imaging to assess kidney health. Completing the prescribed antibiotic course is important. Consult a specialist if you experience repeated UTIs or persistent urinary symptoms.

How do doctors diagnose kidney infections?

Doctors diagnose kidney infections by evaluating symptoms, medical history and laboratory test results. A urine routine examination can help identify signs of infection. It may detect white blood cells, bacteria or blood in the urine. A urine culture helps identify the bacteria causing the infection. It can also guide doctors in selecting suitable antibiotics. Blood tests may be recommended to check for signs of infection and assess kidney function. In more complicated cases, an ultrasound may help identify kidney stones or urinary blockages. A CT scan may be advised when additional imaging is necessary. The choice of tests depends on the patient's symptoms and medical condition. People with recurrent infections may require further evaluation. Early diagnosis helps prevent the infection from becoming more serious. Doctors use the findings to develop an appropriate treatment plan. Seek medical advice if you experience symptoms of a possible kidney infection.

How is a kidney infection treated?

Kidney infections are generally treated with antibiotics prescribed by a doctor. The choice of antibiotic depends on the bacteria responsible for the infection. Urine culture results may help doctors select the most effective medication. Treatment duration varies depending on the severity of the infection and individual health factors. Patients should complete the prescribed course even if symptoms improve. Drinking adequate fluids may help prevent dehydration, unless fluid restriction is medically advised. Pain and fever may be managed with suitable medicines recommended by a doctor. Severe infections may require hospital admission and intravenous antibiotics. Patients who experience vomiting may need intravenous fluids. If kidney stones or urinary blockages are present, additional treatment may be necessary. Doctors may recommend follow-up tests in selected cases. Early treatment can reduce the risk of kidney complications. Never take leftover antibiotics or self-medicate for a suspected kidney infection.

Can kidney infections become serious?

Yes, kidney infections can become serious if they are not diagnosed and treated promptly. Bacteria may spread beyond the kidneys and enter the bloodstream. This can lead to sepsis, which requires urgent medical treatment. Severe infections may cause a sudden decline in kidney function. In some cases, kidney abscesses may develop. Repeated infections can increase the risk of permanent kidney scarring. People with diabetes, weakened immunity or existing kidney problems may face a higher risk of complications. Persistent high fever and severe back pain should never be ignored. Confusion, rapid breathing, dizziness and extreme weakness can indicate a serious infection. Reduced urine output may also require urgent assessment. Early antibiotic treatment can help prevent many complications. Hospital care may be necessary in severe cases. Seek emergency medical attention if you experience signs of sepsis or severe illness.

How can kidney infections be prevented?

Simple daily habits can help reduce the risk of urinary tract and kidney infections. Drink adequate water throughout the day to maintain healthy hydration. Avoid holding urine for long periods. Empty your bladder regularly and completely. Maintain good personal hygiene to reduce bacterial spread. Women should wipe from front to back after using the toilet. Urinating after sexual activity may help reduce the risk of UTIs in some women. Avoid using harsh or scented intimate hygiene products. Manage conditions such as diabetes with appropriate medical care. Seek treatment when urinary symptoms first appear. People with recurrent UTIs should consult a doctor for further evaluation. Follow medical advice if kidney stones or urinary blockages are present. Good urinary habits and timely treatment can help protect kidney health.

Disclaimer: The information provided in this blog is intended for general knowledge and informational purposes only, and does not constitute medical advice. Always consult with a qualified healthcare professional for any medical concerns or before making any decisions about your health.